Antonio Cánovas del Castillo y Vallejo, better known as Kaulak (22 December 1862 – 13 September 1933), was a Spanish photographer, art critic, editor and amateur painter.

His uncle was prime minister Antonio Cánovas del Castillo, assassinated in 1897 by an anarchist, hence his use of a pseudonym; the meaning of which is unexplained, although the word appears to be of Basque origin.

This included high positions in the ministries of Interior and Justice, as well as holding a seat in the Cortes (legislature), representing the constituency of Cieza, in the early 1890s.

As for his photographic activity, he opposed pictorialism, which was the prevalent approach at the time, in favor of professional portraits, rendered in a "purist" manner.

In 1901, he created the magazine, La Fotografía, which for many years served as the official organ of the Real Sociedad Fotográfica [es].